Lab Goal/Question: What are the parameters behind a water polo shot?
Procedure:
Part 1: Video of Water Polo Shot
2 meter shot
6 meter shot
Materials: Video camera, meter stick, Logger pro, water polo ball.
1. Film a person making a water polo shot from the 2 meter line using the video camera. 2. Film the same person making a water polo shot from 6 meters away from the goal using a video camera. 3. Using a meter stick, measure the height of the goal post above water. Record this data. 4. Record the mass of the water polo ball and convert it into kilograms. 5. Upload the first video to Logger pro. 6. Make points by following the motion of the ball until it hits the back of the goal. 7. Set a scale by labeling from the top of the goal post to the spot where it touches the water the distance that you measured in part 3… (Should be 1 meter). 8. Create a calculated column with both x and y-velocities so that you can find the acceleration of the water polo ball. Go to data and click on new calculated column 9. Once you have clicked new calculated column, for name put in "x-velocity and y-velocity", for short name put "velocity", for units put "m/s", and for the equation put " Sqrt("X Velocity"^2+"Y Velocity"^2)". Click done. 10. Now go to insert and click on graph. Click on "velocity". 11. Find the acceleration of the ball by pressing the examine button, then highlighting the point at which the ball was thrown to the point at which the ball hit he goal. Click the "x=" button and examine the slope. 12. Record the slope as your acceleration in your data table. 13. Using the equation Fnet= mass * acceleration, find Fnet by multiplying the mass of the water polo ball by the acceleration you found in step 11. 14. Record this answer in your data table. 15. Repeat steps 5-14 using the second video.
Materials: Projectile launcher, 5 meter sticks, marble
Procedure: Part A 1. First, set the projectile launcher down on a level surface (preferably on the floor). 2. Set the angle on the launcher to 50 degrees 3. Place a regular marble in the launcher on the first setting. 4. Lay out the meter sticks from tip to tip in front of the projectile launcher and make sure to line up the first meter stick according to the place marked on the launcher where the ball is at (1st level). 5. Have your partner stand near the meter sticks and watch to see where the marble will land. 6. Pull on the string on the projectile launcher. Have your partner mark where the ball lands and record this in your data as trial one. 7. Repeat the procedure and this time call it trial 2. Do this for angles: 50, 40, 30, 20 and 10.
Part B 1. Repeat the same procedure as above, doing 2 trials of each angle, except do these trials with the marble set on the third setting to maximize the force exerted on the ball. 2. Record your data in your data table. Data/ Calculations:
Part 1: Video of Water Polo Shot
Mass of water polo ball = 425 grams.
acceleration of distance 1: 6.889 m/s/s acceleration of distance 2: 7.265 m/s/s
Force of 2 meter shot... Fnet =mass * acceleration Fnet=425 * 6.889 2927.83 N
force of 6 meter shot Fnet=mass * acceleration Fnet= 425 * 7.265 Fnet= 3087.63 N
Part 2: Water Polo Shot Simulation
Degrees
Distance marble went (meters) on first force level T1
Distance marble went (meters) on first force level T2
Distance marble went (meters) on third force level T2
Distance marble went (meters) on third force level T2
10
.88
.85
1.9
1.85
20
1.2
1.15
3.0
3.0
30
1.4
1.4
3.8
3.8
40
1.5
1.5
4.0
4.0
50
1.6
1.6
4.5
4.45
Conclusion: Part 1 We observed that the acceleration of the water polo ball in part 1 was smaller than the acceleration in part 2. Since the mass of the water polo ball stayed constant, the force of the second shot was greater than the first because force is iversely related to mass and acceleration. It makes sense that the force was greater in the second shot (6 meters) because Camilla had to throw the ball a greater distance in order to make the shot. A water polo player that wants to take a shot from 2 meters should exert about 2927.83 Newtons of force in order to make the shot forceful. A water polo player that is going to take a shot from the 6 meter line should exert around 3087.63 Newtons of force in order to make the ball get into the goal. Part 2 Looking at our data table it is evident that the distance the marble goes increases as the degree of the shot increases. In the first 2 trials, as the measure of the angle increases, the distance the marble minorly increases. In part 2, as the measure of the angle increases, the distance the marble goes increases much more dramatically than the distance the marble covered in part 1. It is clear that increasing the force that the marble is launched at also increases the distance, as shown by the data above. All of the data under the third setting with the most force is larger than the data under the 1st setting. The closer you are to the goal, let’s say the 2 meter line, then the smaller the degree needs to be to make a shot because you have less distance between yourself and the goal. If you use a lot of force to make a shot, then you will not need to be as close to the goal because the more force you use, the greater the distance the ball travels. If you want to make a shot from the five meter line, then you will need to increase the angle of your arm. Let’s say that there is no defender on you and you have the option of either swimming closer to the goal or taking a shot. If you do not want to exert a large amount of force, then swim closer to the goal and take your shot because the closer you are to the goal and decrease the amount of distance for the shot, the less amount of force you will need to exert. Remember to increase the angle to make up for a lack of force. If you want to make a really forceful shot, then swim closer and exert maximum force with a small angle.
Title: Water Polo Shot
Lab Goal/Question: What are the parameters behind a water polo shot?
Procedure:
Part 1: Video of Water Polo Shot
2 meter shot
6 meter shot
Materials: Video camera, meter stick, Logger pro, water polo ball.
1. Film a person making a water polo shot from the 2 meter line using the video camera.
2. Film the same person making a water polo shot from 6 meters away from the goal using a video camera.
3. Using a meter stick, measure the height of the goal post above water. Record this data.
4. Record the mass of the water polo ball and convert it into kilograms.
5. Upload the first video to Logger pro.
6. Make points by following the motion of the ball until it hits the back of the goal.
7. Set a scale by labeling from the top of the goal post to the spot where it touches the water the distance that you measured in part 3… (Should be 1 meter).
8. Create a calculated column with both x and y-velocities so that you can find the acceleration of the water polo ball. Go to data and click on new calculated column
9. Once you have clicked new calculated column, for name put in "x-velocity and y-velocity",
for short name put "velocity", for units put "m/s", and for the equation put " Sqrt("X Velocity"^2+"Y Velocity"^2)". Click done.
10. Now go to insert and click on graph. Click on "velocity".
11. Find the acceleration of the ball by pressing the examine button, then highlighting the point at which the ball was thrown to the point at which the ball hit he goal. Click the "x=" button and examine the slope.
12. Record the slope as your acceleration in your data table.
13. Using the equation Fnet= mass * acceleration, find Fnet by multiplying the mass of the water polo ball by the acceleration you found in step 11.
14. Record this answer in your data table.
15. Repeat steps 5-14 using the second video.
Part 2: Water polo shot simulation
Materials: Projectile launcher, 5 meter sticks, marble
Procedure:
Part A
1. First, set the projectile launcher down on a level surface (preferably on the floor).
2. Set the angle on the launcher to 50 degrees
3. Place a regular marble in the launcher on the first setting.
4. Lay out the meter sticks from tip to tip in front of the projectile launcher and make sure to line up the first meter stick according to the place marked on the launcher where the ball is at (1st level).
5. Have your partner stand near the meter sticks and watch to see where the marble will land.
6. Pull on the string on the projectile launcher. Have your partner mark where the ball lands and record this in your data as trial one.
7. Repeat the procedure and this time call it trial 2. Do this for angles: 50, 40, 30, 20 and 10.
Part B
1. Repeat the same procedure as above, doing 2 trials of each angle, except do these trials with the marble set on the third setting to maximize the force exerted on the ball.
2. Record your data in your data table.
Data/ Calculations:
Part 1: Video of Water Polo Shot
Mass of water polo ball = 425 grams.
acceleration of distance 1: 6.889 m/s/s
acceleration of distance 2: 7.265 m/s/s
Force of 2 meter shot...
Fnet =mass * acceleration
Fnet=425 * 6.889
2927.83 N
force of 6 meter shot
Fnet=mass * acceleration
Fnet= 425 * 7.265
Fnet= 3087.63 N
Part 2: Water Polo Shot Simulation
Conclusion:
Part 1
We observed that the acceleration of the water polo ball in part 1 was smaller than the acceleration in part 2. Since the mass of the water polo ball stayed constant, the force of the second shot was greater than the first because force is iversely related to mass and acceleration. It makes sense that the force was greater in the second shot (6 meters) because Camilla had to throw the ball a greater distance in order to make the shot.
A water polo player that wants to take a shot from 2 meters should exert about 2927.83 Newtons of force in order to make the shot forceful. A water polo player that is going to take a shot from the 6 meter line should exert around 3087.63 Newtons of force in order to make the ball get into the goal.
Part 2
Looking at our data table it is evident that the distance the marble goes increases as the degree of the shot increases. In the first 2 trials, as the measure of the angle increases, the distance the marble minorly increases. In part 2, as the measure of the angle increases, the distance the marble goes increases much more dramatically than the distance the marble covered in part 1. It is clear that increasing the force that the marble is launched at also increases the distance, as shown by the data above. All of the data under the third setting with the most force is larger than the data under the 1st setting. The closer you are to the goal, let’s say the 2 meter line, then the smaller the degree needs to be to make a shot because you have less distance between yourself and the goal. If you use a lot of force to make a shot, then you will not need to be as close to the goal because the more force you use, the greater the distance the ball travels. If you want to make a shot from the five meter line, then you will need to increase the angle of your arm. Let’s say that there is no defender on you and you have the option of either swimming closer to the goal or taking a shot. If you do not want to exert a large amount of force, then swim closer to the goal and take your shot because the closer you are to the goal and decrease the amount of distance for the shot, the less amount of force you will need to exert. Remember to increase the angle to make up for a lack of force. If you want to make a really forceful shot, then swim closer and exert maximum force with a small angle.